Preheat oven to 375F. Line a baking sheet with parchment or a silicone mat.
Add flour, baking powder, and black pepper to a large mixing bowl. Mix well.
Shred cheese if needed, then add sausage, cheese, and sourdough starter to the dry ingredients. Mix with a wooden spoon or your hands (hands is easier). You will need to break the ground sausage up and thoroughly incorporate all the other ingredients throughout.
Roll the uncooked sausage balls into 1-inch balls and place them on the baking tray. They don’t spread much so you can put them pretty close together.